Wiring Diagram for 5 x 10 enclosed trailer, ramp door/ no side door.

I have an enclosed trailer from Interstate Cargo. The enclosure measures 5 by 10 with a ramp rear door, and no side door, the wiring connects to the vehicle with a 4 pin. Recently the trailer lights stopped working. Having repaired many trailer lights myself I set to undertake the repair. I have removed the plywood from the rear door and I saw that the rear lights are, in fact, 4 separate light units that have been wired together.

I can’t seem to get the lights to work and I’m curious whether the green and black wires coming from the lights should connect to the yellow, green, or brown wires on the standard trailer lighting set up. I also noticed a white cable coming from underneath a piece of metal that connects the two lights on each side. Is this a ground? Was it supposed to connect to something? Which wires should the license plate light connect to?

My second question is whether you sell the Allen wrench “nuts” that fit onto the end of the carriage bolts that hold the exterior door locking mechanism to the ramp. It appears that previous repairs to the lighting on this company trailer have stripped the “nut” making it impossible to put the “nut” back on.Where can I find these washer/allen/nut things and what are they called.

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Answers

Thanks for taking the time to write in. The white wire is in fact the ground in this system. There should be one going to the frame on the front of the trailer. The white coming from the lights should be connected to the the white coming from the front. The license plate light will be connected to the brown wire that is the marker lights, the left turn is the yellow and right turn is green. Before taking a lot of things apart on the trailer, it is always wise to start from the tow vehicle then from the front of the trailer back. The wires run up the front curbside corner inside and along the top curbside to the rear. In the center, the side marker lights get there power. For the cam nuts on the ramp that is a T-45 torx head the cam nut are available on our web site or from any of our TrailersPlus locations.

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